Electrostatics & Capacitors · JEE Main previous year questions

2022 56 questions

1. Q452022 · 25 Jun 2022 · Shift 2

   A light whose electric field vectors are completely removed by using a good polaroid, allowed to incident on the surface of the prism at Brewster's angle. Choose the most suitable option for the phenomenon related to the prism.

   1. A.Reflected and refracted rays will be perpendicular to each other.
   2. B.Wave will propagate along the surface of prism.
   3. C.No refraction, and there will be total reflection of light.
   4. D.No reflection, and there will be total transmission of light.
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   Answer: D

2. Q342022 · 24 Jun 2022 · Shift 2

   Two identical charged particles each having a mass $10\mathrm{g}$ and charge $2.0\times 10^{-7}\mathrm{C}$ are placed on a horizontal table with a separation of L between them such that they stay in limiting equilibrium. If the coefficient of friction between each particle and the table is 0.25, find the value of L. [Use $\mathrm{g}=10\mathrm{m}{\mathrm{s}}^{-2}$]

   1. A.$12\mathrm{cm}$
   2. B.$10\mathrm{cm}$
   3. C.$8\mathrm{cm}$
   4. D.$5\mathrm{cm}$
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   Answer: A

3. Q392022 · 24 Jun 2022 · Shift 2

   Given below are two statements : Statement I : The reactance of an ac circuit is zero. It is possible that the circuit contains a capacitor and an inductor. Statement II : In ac circuit, the average power delivered by the source never becomes zero. In the light of the above statements, choose the correct answer from the options given below.

   1. A.Both Statement I and Statement II are true.
   2. B.Both Statement I and Statement II are false.
   3. C.Statement I is true but Statement II is false.
   4. D.Statement I is false but Statement II is true.
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   Answer: C

4. Q442022 · 24 Jun 2022 · Shift 2

   If the charge on a capacitor is increased by 2 C, the energy stored in it increases by 44%. The original charge on the capacitor is (in C)

   1. A.10
   2. B.20
   3. C.30
   4. D.40
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   Answer: A

5. Q562022 · 24 Jun 2022 · Shift 2· Numerical answer

   A monoatomic gas performs a work of $\frac{Q}{4}$ where Q is the heat supplied to it. The molar heat capacity of the gas will be ____ R during this transformation. Where R is the gas constant.

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   Answer: 2

6. Q572022 · 24 Jun 2022 · Shift 2· Numerical answer

   An antenna is placed in a dielectric medium of dielectric constant $6.25$. If the maximum size of that antenna is $5.0\mathrm{mm}$, it can radiate a signal of minimum frequency of ____ $\mathrm{GHz}$. (Given ${\mu }_r=1$ for dielectric medium)

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   Answer: 6